Limited working range scanner having focused light beam waist si

Details Limited working range scanner having focused light beam waist si Limited working range scanner having focused light beam waist si

1996-12-19

1998-07-21

Hajeo, Donald T.

Registers

Coded record sensors

Particular sensor structure

235462, G06K 710

Patent

active

057838135

ABSTRACT:
An electro-optical triggerless reader reads indicia having parts of different light reflectivity within a limited working range of distances relative to the reader. A light beam is focused to have its minimum beam cross-section, as considered along a scan direction, or waist situated within a housing for the reader, thereby enabling the reader to read indicia located adjacent the reader housing.

REFERENCES:
patent: 5140144 (1992-08-01), Shepard et al.
patent: 5200597 (1993-04-01), Eastman et al.
patent: 5408081 (1995-04-01), Barkan

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